diff --git a/src/org/olap4j/driver/xmla/XmlaOlap4jDatabaseMetaData.java b/src/org/olap4j/driver/xmla/XmlaOlap4jDatabaseMetaData.java
index ddb1b4a..7f125a5 100644
--- a/src/org/olap4j/driver/xmla/XmlaOlap4jDatabaseMetaData.java
+++ b/src/org/olap4j/driver/xmla/XmlaOlap4jDatabaseMetaData.java
@@ -52,9 +52,11 @@ private ResultSet getMetadata(
         XmlaOlap4jConnection.MetadataRequest metadataRequest,
         Object... patternValues) throws OlapException
     {
+        final Map<XmlaOlap4jConnection.MetadataColumn, String> overrides =
+            Collections.emptyMap();
         return getMetadata(
             metadataRequest,
-            Collections.emptyMap(),
+            overrides,
             patternValues);
     }